I just love this show. The storyline, concept/plot, cast, etc with a lot of twists and turns. This is a supernatural genre, you must watch it if you like the goblin, the king, abyss, tomorrow with you, etc. The story is unique with 5 main leads and obviously, a love triangle, and the other one is filled with sadness, kind of romantic and I find it cute tho I really do hope it will be a happy ending, even the osts are really good *Seo In-guk's comeback as a singer too. ps, it might also make you cry.
I highly recommend this show.